[chowells]

My criteria for acceptable product testimonials:

1. It's truthful.

2. It's about the product itself, not about how it could change your life.

3. There's no monetary consideration for it - not even the product being provided at a discount or free.

Your last two examples are the ones that are on the right side of all of those lines.

And yes, I pay for youtube premium and twitch turbo. Doing so improved the quality of those services immensely.